A methodology is presented to construct virtual domain ontologies reusing other domain knowledge already available. This methodology uses the semantic relevance of existing domain models and domain ontologies, and proposes the possibility of building ontologies following the view of semantic match. Firstly, a structural definition of domain ontology is given. Secondly, the semantic relevance between domain model and ontologies is discussed and a definition of relevance degree is given. Based on the evolution of population, the domain ontologies constructing technologies in the terminology from genetics such as selection, clone, mutation, crossover, synthesis and transgenic are discussed. Finally, a VDO (virtual domain ontologies) constructing system is introduced, and a case study in the field of some hotels and travel agencies is demonstrated.